There is no "Browse With" option on the .aspx Views in an MVC project as they are not meant to be directly browseable.
What I tend to do is add a Default.aspx webform in the root of the site and this, when right clicked, will give you the Browse With option. You need to make sure to update your routing though otherwise IIS/Cassini will try to serve it up, something like this
public void Page_Load(object sender, System.EventArgs e) {
// Change the current path so that the Routing handler can correctly interpret
// the request, then restore the original path so that the OutputCache module
// can correctly process the response (if caching is enabled).
string originalPath = Request.Path;
HttpContext.Current.RewritePath(Request.ApplicationPath, false);
IHttpHandler httpHandler = new MvcHttpHandler();
httpHandler.ProcessRequest(HttpContext.Current);
HttpContext.Current.RewritePath(originalPath, false);
}
Also, another quicky is to hit CTRL-F5 (run without debugging) which will fire up the site without going into debug mode..